JPH06129732A - Refrigerant condenser - Google Patents

Abstract

PURPOSE:To improve a heat exchanging performance of a refrigerant condenser by a method wherein a pass changing header or a connection pipe is eliminated and a flowing direction of the refrigerant is set to a counterflow against a flowing direction of suction air while reducing the cost. CONSTITUTION:An outlet end of each of a first inlet flow passage pipe 20 and a second inlet flow passage pipe 21 is connected to an inlet end of each of outlet flow passage pipes 22 by a three-way pipe 23, thereby a plurality of tubes 19 are arranged in such a way that a flowing direction of refrigerant ranging from the inlet side to the outlet side becomes a counter-flow against the flowing direction of the suction air. In addition, a flow passage area of refrigerant flowing at the outlet side is reduced lower than a flow passage area of refrigerant flowing at the inlet side of a plurality of tubes 19 of a refrigerant condenser 3, and a flow speed of the refrigerant ranging from the inlet side of a plurality of tubes 19 to the outlet side of them is kept substantially constant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant condenser for condensing and liquefying a high temperature, high pressure vapor phase refrigerant discharged from a refrigerant compressor by exchanging heat with suction air.

[0002]

2. Description of the Related Art Conventionally, the refrigerant state on the inlet side of a refrigerant condenser used in a vehicle air conditioner is a single-phase state of a gas-phase refrigerant, and the refrigerant is cooled by exchanging heat with intake air. The proportion of the liquid-phase refrigerant increases as the temperature increases. Then, the refrigerant state on the outlet side of the refrigerant condenser becomes a single phase of the liquid-phase refrigerant. Therefore, in the refrigerant condenser, the volume of the refrigerant gradually decreases from the inlet side to the outlet side due to the phase change of the refrigerant from the gas phase to the liquid phase. Therefore, when the flow passage area composed of a plurality of tubes is constant from the inlet side to the outlet side of the refrigerant, the flow velocity of the refrigerant becomes slower as it approaches the outlet side. There is a problem that the heat transfer rate decreases. Therefore, conventionally, in the refrigerant condenser, the flow passage area composed of a plurality of tubes is changed so that the flow velocity of the refrigerant becomes constant from the inlet side to the outlet side of the refrigerant. . In such a refrigerant condenser 100, as shown in FIG. 8 to FIG. 10, the number of inlet side flow pipes 101 (the number of passes) is set to 10 to increase the flow passage area on the inlet side of the refrigerant, and to increase the outlet. Side flow pipe 1
The number of 02 (pass number) is reduced to 5 to reduce the flow passage area on the refrigerant outlet side (Japanese Utility Model Laid-Open No. 58-169468, etc.).

[0003]

However, in the conventional refrigerant condenser 100, as shown in FIG. 10, the number of inlet side flow passage pipes 101 and the number of outlet side flow passage pipes 102 are changed (passage). In order to change the number), the header 103 on the inlet side
In addition to the exit side header 104, the path changing header 10
5 is attached. Therefore, the flow direction of the refrigerant flowing from the inlet header 103 toward the path changing header 105 is counter to the flow direction of the suction air, but the refrigerant flowing from the changing header 105 toward the outlet header 104. There is a problem that the flow direction of is a parallel flow with respect to the flow direction of the intake air, and the heat exchange performance is deteriorated as compared with the counter flow that is excellent in heat exchange. Further, the refrigerant condenser is divided into upper and lower parts, an inlet side header and an outlet side header are provided on both sides, and the upper outlet side header and the lower side inlet side header are connected by a connecting pipe to connect the refrigerant flow direction and the suction air. There are also those in which the flow direction of is opposite to the flow direction. However, this refrigerant condenser has a problem that the cost increases due to the increase in the number of headers and the complicated handling of the connecting pipes.

The present invention improves the heat exchange performance by making the flow direction of the refrigerant counterflow to the flow direction of the intake air while reducing the cost by eliminating the path changing header and the connecting pipe. It is an object of the present invention to provide a refrigerant condenser that enables the above.

[0005]

According to the present invention, in a refrigerant condenser for condensing and liquefying a gas-phase refrigerant flowing into a plurality of tubes by heat exchange with suction air, the plurality of tubes are a flow of a refrigerant. A plurality of inlet-side flow passage pipes arranged so that the directions thereof are opposite to the flow direction of the intake air, and the flow direction of the refrigerant is arranged to be opposite flow to the flow direction of the intake air. A number of outlet side flow pipes smaller than the plurality of inlet side flow pipes, and two or more inlet side flow pipes of the plurality of inlet side flow pipes are connected to each other. Two or more inlet parts, and one or more outlets communicating with these inlet parts and to which the inlet ends of one or more outlet side flow pipes of the plurality of outlet side flow pipes are connected A technical means was adopted which comprises a plurality of multi-directional tubes having parts.

[0006]

The gas-phase refrigerant flows into two or more inlet-side flow passage tubes, exchanges heat with the suction air, and gradually changes its phase from the gas phase to the liquid phase. The refrigerant flowing from the outlet ends of the two or more inlet side flow pipes into the multi-way pipe through the two or more inlet parts is in the one or more outlet side flow pipes through the one or more outlet parts. Flow into and exchange heat with the suction air. As a result, due to the multi-way pipe, the flow passage area of the refrigerant flowing in the two or more inlet side flow pipes (the inlet side of the plurality of tubes) is one or more of the outlet side flow pipes (the outlet side of the plurality of tubes). ), The flow area of the refrigerant flowing through the refrigerant is small, so that the flow velocity of the refrigerant flowing on the outlet side of the multiple tubes can be prevented from being slower than the flow velocity of the refrigerant flowing on the inlet side. Can be avoided. Incidentally, the plurality of inlet side flow pipes and the plurality of outlet side flow pipes are arranged so that the flow direction of the refrigerant is a counter flow with respect to the flow direction of the suction air. Since the heat exchange performance is excellent, all the refrigerants are in the single phase state of the liquid phase refrigerant at the outlet end of the outlet side flow pipe.

[0007]

【Example】

[Configuration of Embodiment] Next, a refrigerant condenser of the present invention will be described based on an embodiment shown in FIGS. 1 to 7. here,
FIG. 1 is a diagram showing a refrigerant condenser, and FIG. 2 is a diagram showing a refrigeration cycle. The refrigeration cycle 1 is incorporated in an air conditioner for a bus vehicle. As shown in FIG. 2, this refrigeration cycle 1 connects a refrigerant compressor 2, a refrigerant condenser 3, a receiver 4, a super cooler 5, a dryer 6, a sight glass 7, an expansion valve 8 and a refrigerant evaporator 9 in order. It becomes.
Further, the refrigeration cycle 1 bypasses the super cooler 5, the dryer 6, the sight glass 7, the expansion valve 8 and the refrigerant evaporator 9, and connects the vapor phase refrigerant side of the receiver 4 and the suction side of the refrigerant compressor 2 to each other. A bypass pipe line 10 is provided.

The refrigerant compressor 2 is rotatably driven by the engine 11 and compresses the vapor phase refrigerant sucked inside from the receiver 4 or the refrigerant evaporator 9 to discharge the high temperature and high pressure vapor phase refrigerant to the refrigerant condenser 3. To do. A radiator 12 that cools cooling water in a water jacket (not shown) of the engine 11 is connected to the engine 11. The radiator 12, together with the refrigerant condenser 3 and the super cooler 5, is attached to a place where the running wind of an automobile is easily received. The refrigerant condenser 3 is a heat exchanger that is connected to the discharge side of the refrigerant compressor 2 and heat-exchanges the high-temperature, high-pressure gas-phase refrigerant that has flowed into the refrigerant compressor 2 with the suction air to condense and liquefy it.

The receiver 4 is connected to the outlet side of the refrigerant condenser 3, separates the gas-phase refrigerant from the liquid-phase refrigerant, returns the gas-phase refrigerant directly to the suction side of the refrigerant compressor 2, and reduces the air conditioning load. A corresponding required amount of liquid-phase refrigerant is supplied to the super cooler 5. The super cooler 5 is a heat exchanger that is connected to the liquid-phase refrigerant side of the receiver 4 and exchanges heat of the liquid-phase refrigerant that has flowed into the interior of the receiver 4 with the suction air to give the refrigerant a supercooling degree. The dryer 6 is connected to the downstream side of the super cooler 5 and is filled with a desiccant or the like for removing water in the liquid-phase refrigerant. The sight glass 7 is connected to the downstream side of the dryer 6 and observes the state of the refrigerant flowing in the refrigeration cycle 1.

The expansion valve 8 is, for example, an automatic temperature expansion valve, is connected to the inlet side of the refrigerant evaporator 9, and is a high-temperature, high-pressure liquid sent from the supercooler 5 via the dryer 6 and the sight glass 7. The phase refrigerant is adiabatically expanded into a low temperature, low pressure atomized refrigerant. The refrigerant evaporator 9 is connected between the suction side of the refrigerant compressor 2 and the downstream side of the expansion valve 8 and blows a gas-liquid two-phase atomized refrigerant into the blower (not shown) from the expansion valve 8.
Is a heat exchanger that evaporates and vaporizes by exchanging heat with the air blown by. A bypass valve 13 for intermittently opening and closing the bypass pipeline 10 is attached in the middle of the bypass pipeline 10.

Next, the structure of the refrigerant condenser 3 of this embodiment will be described in detail. As shown in FIG. 1, the refrigerant condenser 3 includes an inflow connection pipe 15 for allowing the high-temperature, high-pressure gas-phase refrigerant discharged from the discharge side of the refrigerant compressor 2 to flow into the inlet-side header 14, and From the outlet header 16 to the receiver 4
An outflow connecting pipe 17 for outflowing a high-temperature, high-pressure liquid-phase refrigerant is provided. The inlet-side header 14 and the outlet-side header 16 are cylindrical containers attached to the right side of the plurality of plate-like fins 18 of the refrigerant condenser 3, and the side walls thereof are joined to the ends of the plurality of tubes 19. A plurality of bonding holes (not shown) for forming are formed.

3 and 4 are views showing a schematic structure of the refrigerant condenser 3. As shown in FIGS. 3 and 4, the plurality of tubes 19 include five first inlet-side flow pipes 20,
Five second inlet side flow pipes 21, five outlet side flow pipes 22
And five three-way tubes 23. As shown in FIGS. 3 and 4, the five first inlet side flow pipes 20 have their inlet ends joined to the inlet header 14 and their outlet ends brazed to one inlet portion 24 of the three-way pipe 23. Are joined by means of. Further, the first inlet-side flow passage pipe 20 passing through the uppermost side of the refrigerant condenser 3 has four U-shaped pipe portions 25 (FIGS. 1, 4 and 4) arranged so as to penetrate the plurality of plate fins 18. 7), and two Us that project from the rightmost plate-like fin 18 and connect adjacent U-shaped pipe portions 25 to each other.
The character tube portion 27 (see FIGS. 6 and 7) is used. The other first inlet side flow path pipes 20 are also configured in a substantially similar pattern.

The second inlet side flow pipe 21 is shown in FIG. 3 and FIG.
As shown in FIG. 5, the inlet end is joined to the insertion hole of the inlet header 14 and the outlet end is joined to one inlet portion 28 of the three-way pipe 23 by means such as brazing. Further, the second inlet side flow pipe 21 passing through the uppermost side of the refrigerant condenser 3 has four U-shapes arranged so as to penetrate the plurality of plate fins 18 as shown in FIGS. 5 to 7. Two U-shaped pipe portions 31 (see FIGS. 6 and 7) that project from the pipe portion 29 (see FIGS. 1 and 7) and the U-shaped pipe portions 29 that are adjacent to each other and project from the rightmost plate-shaped fin 18 See)). The other second inlet side flow pipes 21 are also configured in a substantially similar pattern.

As shown in FIGS. 3 and 4, the outlet side flow pipe 22 has an inlet end joined to the outlet portion 32 of the three-way pipe 23 by means such as brazing, and the outlet end is connected to the outlet side header 16.
Is joined to. Further, the outlet-side flow passage pipe 22 passing through the uppermost side of the refrigerant condenser 3 has two U-shaped pipe portions arranged so as to penetrate the plurality of plate-shaped fins 18 as shown in FIGS. 5 to 7. 33 (see FIGS. 1, 4 and 7), and one U-shaped pipe portion 34 (see FIG. 5) which projects from the rightmost plate-shaped fin 18 and connects adjacent U-shaped pipe portions 33 to each other. It is composed of The other outlet side flow pipes 22 are also configured in a substantially similar pattern. The three-way tube 23 is
The multi-way pipe of the present invention, which is arranged on the outer side of the rightmost plate-like fin 18, and which connects the outlet ends of the first and second inlet-side channel pipes 20 and 21 and the inlet end of the outlet-side channel pipe 22. It is intended for communication. As shown in FIGS. 1, 3, 6, and 7, the three-way pipe 23 has two inlet portions (inlet ports) 2
4, 28 and one outlet (outlet port) 32 are provided.

[Operation of the Embodiment] Next, the operation of the refrigeration cycle 1 will be briefly described with reference to FIGS. 1 to 7. The high-temperature, high-pressure vapor-phase refrigerant compressed by the refrigerant compressor 2 flows into the inlet-side header 14 through the inflow connecting pipe 15 and flows into the first and second inlet-side flow passage pipes 20 and 21. To be distributed. The gas-phase refrigerant distributed to the first and second inlet side flow pipes 20 and 21 makes a U-turn in the U-shaped pipe portions 25, 27, 29 and 31 while flowing from the inlet end to the outlet end. While repeating the above, heat is exchanged with suction air flowing in the direction of flow of the refrigerant to be condensed and liquefied to be in a gas-liquid two-phase state.

The refrigerant in the gas-liquid two-phase state is composed of the first,
From the outlet ends of the second inlet side flow pipes 20 and 21, the inlet portion 24,
It flows into each of the three-way pipes 23 through 28, and then flows into the outlet side flow pipe 22 from the outlet portion 32. Further, the gas-liquid two-phase state refrigerant flowing into the outlet-side flow pipe 22 is U-shaped in the U-shaped pipe portions 33 and 34 while flowing from the inlet end to the outlet end.
While repeating the turns, heat is exchanged with the suction air flowing in the direction opposite to the flow direction of the refrigerant. The suction air is on the windward side of the suction air passing outside the first and second inlet side flow pipes 20 and 21. Therefore, the gas-liquid two-phase refrigerant is sufficiently cooled by the suction air, and the outlet side flow pipe 22
The liquid refrigerant is in a single-phase state near the outlet end of the. And
The liquid-phase refrigerant flows into the outlet-side header 16 from each outlet-side flow pipe 22, passes through the outlet connection pipe 17, and then the receiver 4
Sent to.

[Effects of Embodiment] As described above, the refrigerant condenser 3 incorporated in the refrigeration cycle 1 includes the outlet ends of the first and second inlet side flow pipes 20 and 21 and the outlet side flow pipes. By connecting the inlet end of 22 with the three-way pipe 23, the flow passage area of the refrigerant flowing on the outlet side is smaller than the flow passage area of the refrigerant flowing on the inlet side of the plurality of tubes 19. Therefore,
Since it is possible to prevent the flow rate of the refrigerant flowing on the outlet side of the plurality of tubes 19 from being slower than the flow rate of the refrigerant flowing on the inlet side of the plurality of tubes 19, it is possible to prevent the heat transfer coefficient from the refrigerant to the intake air from decreasing. . In addition, the refrigerant condenser 3 connects the outlet ends of the first and second inlet side flow pipes 20 and 21 and the inlet end of the outlet side flow pipe 22 with a three-way pipe 23 to thereby provide a path changing header. Although the cost is reduced by abolishing the connection and eliminating the complicated handling of the connecting pipe, the refrigerant flow direction from the inlet side to the outlet side is opposite to the suction air flow direction. A plurality of tubes 19 can be arranged so that Therefore, the refrigerant condenser 3 has excellent heat exchange performance between the refrigerant and the suction air. Therefore, the cooling performance of the refrigerant evaporator 9 can be improved as compared with the conventional refrigeration cycle.

[Modification] In this embodiment, the three-way tube 23 is used as the multi-way tube, but a multi-way tube of four or more way tubes may be used as the multi-way tube. However, it is necessary to connect the inlet side flow passage pipe and the outlet side flow passage pipe to the multi-directional pipe so that the flow passage area of the plurality of tubes from the inlet side to the outlet side is reduced. For example, when a five-sided pipe is used, the number of paths on the upstream side may be 4, the number of paths on the downstream side may be 1, and the number of paths on the upstream side may be 3,
The number of paths on the downstream side may be two. In the present embodiment, the number of passes of the plurality of tubes 19 is changed from 10 to 5 only once, but the number of passes of the plurality of tubes 19 is reduced by decreasing from 10 to 7 and further decreasing from 7 to 3. You may change it multiple times.

[0019]

The present invention reduces the flow passage area on the outlet side from the flow passage area on the inlet side in order to make the flow velocity of the refrigerant constant from the inlet side to the outlet side of the refrigerant of a plurality of tubes. You can Therefore, the heat transfer coefficient from the refrigerant to the suction air can be improved. Moreover, while reducing the cost by eliminating the path changing header and the connecting pipe, the refrigerant flow direction from the refrigerant inlet side to the outlet side of the plurality of tubes is changed with respect to the suction air flow direction. Can be counter-current. Therefore, the heat exchange performance of the refrigerant condenser can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a refrigerant condenser according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a schematic configuration of a refrigeration cycle used in one embodiment of the present invention.

FIG. 3 is a schematic diagram showing a schematic structure of a refrigerant condenser according to an embodiment of the present invention.

FIG. 4 is a schematic structural view of a refrigerant condenser according to an embodiment of the present invention seen from above.

FIG. 5 is a schematic structural view showing a left side surface of a refrigerant condenser according to an embodiment of the present invention.

FIG. 6 is a schematic structural view showing a right side surface of a refrigerant condenser according to an embodiment of the present invention.

FIG. 7 is an enlarged perspective view showing the right side surface of the refrigerant condenser according to the embodiment of the present invention.

FIG. 8 is a perspective view showing a conventional refrigerant condenser.

FIG. 9 is a schematic structural view showing a right side surface of a conventional refrigerant condenser.

FIG. 10 is a schematic diagram showing a schematic structure of a conventional refrigerant condenser.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 3 Refrigerant condenser 19 Plural tubes 20 1st inlet side passage pipe 21 2nd inlet side passage pipe 22 Outlet side passage pipe 23 Three-way pipe (multi-way pipe) 24 Inlet portion 28 Inlet portion 32 Outlet portion

Claims (1)

[Claims] 1. A refrigerant condenser for condensing and liquefying gas-phase refrigerant flowing into a plurality of tubes by heat exchange with suction air, wherein the plurality of tubes have a refrigerant flow direction in the suction air flow direction. A plurality of inlet side flow pipes arranged so as to be opposed to each other, and the inlet side flows of the plurality of inlet side flow pipes are arranged so that the flow direction of the refrigerant is opposite to the flow direction of the suction air. A smaller number of outlet side flow pipes than the flow pipes, two or more inlet portions to which the outlet ends of two or more inlet side flow pipes of the plurality of inlet side flow pipes are respectively connected, and A plurality of multi-way pipes which are connected to these inlet parts and have one or more outlet parts to which the inlet ends of one or more outlet side flow pipes of the plurality of outlet side flow pipes are connected. And a refrigerant condenser.